Circuit-interrupting system



S. Q. HAYES.

CIRCUIT INTERRUPTING SYSTEM.

APPLICATION men MAY :5. 1911.

352 45 1 v Patented Sept. 14, 1920.

a ll E a 21% v 22 L as 26' WITNESSES: INVENTOR J/P/I'fl Q fiayea. Mil,"(4W I ATTORNEY UNIT an SKTATES PATENT OFFICE.

STEPHEN Q. HAYES, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0WESTJ'IQGHOUS! ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OFPENNSYLVANIA.

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i Specification of Letters Patent. Patented Sept, 14, 192() Applicationand m 15, 1917. Serial 110. 168,663.

To all whom it may concern: i

Be it known that I TEPHEN Q. Hares, a citizen of the Unitedfitates, anda resident of Pittsburgh in.the county ofAllegheny and State of vented anew and useful Improvement 111 Circuit-Interrupting Systems, of whichthe following is a specification.

My invention relates to systems of distribution and particularly to thecircuit interruptin means therefor.

.One ob ect of; myfinventionis to rovide means for disconnectin portions0 a load from a circuit, in a predetermined order to preclude the loadon the "circuit from bem maintained in excess of a predetermine value.

Another object of my invention is to revide a system of the aboveindicated 0 aracter that shall be simple to construct and efl'ective andaccurate in its operation,

In practising my invention, I provide a main suppl or load circuit, aplurality of branch 10a circuits and circuit mterrupters for connectingthe branch circuits to'the main circuit. The trip coil of eachinterrupter is so controlled by auxiliary or pallet switches onthe'other interrupters t when the load on the main circuit exceeds thepredetermined value, one interrupter at a time will be tripped untilsuch load is removed that the load on the main circuit is reduced to theKrdetermined value.

The single gure of the accompanying is a diagrammatic view of asysdrawing distribution embodying y inventem of tion.- i

A main 1 ad circuit 1' is adp'pted; to supcurren to a pluralit of loads2, 3,4

and 5 through branch or code! cit Units 6,7, 8 and 9, respectively.Circuit interrupters 10, 11, 12 and 13 are connected between therespective feeder circuits 6, 7, 8 and 9 and the load circuit 1. 4

The circuit interrupters 10, 11,12 and 13 severally comprise stationarycontactmembers 14, move 1e bridging contact members 15, 'a trip coil 16and an auxiliary doublethrdw switch 17 having a movable bridging contactmember 18, a pair ofstationary contact members 19 and a pair ofstationary "contact members 20. The main circuit 1 is provided with tworelays 21 and 22 that are operatively connected through seriestransformers 23 and 24 to the circuit 1; The re- Pennsyl'vania, haveininterrupter 13 hat la 21 and 22 are adapted to be actuated to e ectclosure of their contact members 25 and 26 when a predetermined loadtraverses the circuit 1.

One terminal of the trip coil 16 of each of the circuit interrupters isconnected to one conductor of the circuit 1, and the other terminalofeach of the trip coils 16 is connected to one of the stationary contactmembers 19 ofits auxiliary switch 17. The other stationary contactmember 19 and the correspondingcontact member 20 of the interru ter 13are connected to a circuit 27 that is connected to one conductor of thecircuit 1 and which comprises the contact members 25 and 26 of therelays 21 and .12. The cor-responding contact members 19 and 20 of eachof-the other interrupters are connected to one of the stationary contactmembers 20 of its adjacent interru; one of the stationary contactmembers 20 of the interrupter 13 is connected to one of 'the otherstationary contact members 19 and 20 of the interrupter 12. Thus, whenthe is in its open position and the interrupter 12 is in its closedposition, the circuit through the trip coil 16 of the interrupter 1.2 isso connected in circuit with the contact members 25 and 26 of the re;lays 21 and 22 that if they are, enga ed the circuitainterrupter 12 willbe trippe When the load that traverses the circuit 1 exceeds apredetermined value it is desirable to reduce this load to a safe valueand in order to obtain this, it desirable to disconnect the loads 2, 3,4 and 5 in a certain sequence. That is, when the load 5 is disconnectedif the load on the circuit 1 does not exceed a predetermined.value, it is not desirable to disconnect the loads 2, 3, and 4.However, if the load traversing the circuit 1 still exceeds'the desiredvalue for that circuit the load 4 isdisconnected, and similarly theremaining loads 2 and 3 are successively disconnected to reduce the loadtraversing the circflit 1 to the predetermined value.

The relays 21 and 22 are so adjusted that their contact members 25 and26 are engaged when the load traversing the circuit 1 exceeds apredetermined value, and when the contact members 25 and 26 are engaged.the trip coil 16 of the interraplter 13 is energized to trip the same.'en the interrupter 13 is tripped, its auxiliary switch 17 so connectsthe trip coillfi 'of the interrupter That is,

.load on the circuit 1 has not 5, the interrupter 12 -auxiliarysufiiciently by that if the disconnection of the loads 4 and 5 i notsufiicient to reduce the load on the circuit 1 t'o'such value that therelays 21 and 22 are inoperative, the circuit interrupter 11 will betripped. In a like manner the interrupter 10 will be tripped if thedisconnection of the loads 3, 4 and 5 are not sufficient to reduce theloa on the circuit 1 to the predetermined value that is desired not tobe exceeded therein.

My invention is not limited to the specific structures illustrated norto the method of energizing the relays andtrip coils, as it may bevariously modified Without departing from the s irit and scope of theinvention as set fort in the appended claims.

I claim as my invention:

1. The combination with a main circuit,

a plurality of feeder circuits 'arid interrupters for connecting thefeeder circuits to the main circuit, of a rela responsive to the load inthe main circuit or controlling the tripping of the interrupters, andauxiliary switches actuated by the interrupters for successivelyconnecting the tripping devices in series with the contact relay.

2. The combination ivith a main supply circuit, a plurality of branchcircuits therefor and circuit interrupters for connecting the branchcircuits to the main circuit, of means responsive to the load on themain circuit for tripping the interrupter-s, and auxiliary switchesactuated b the interrupters for successively connecting the trippingmeans to the main circuit.

members of the 3. The combination 'with a main circuit, a plurality offeeder circuits, circuit interrupters for connecting the feeder circuitsto the main circuit and trip coils for the interrupters, of a relayresponsive to the load on the main circuit for controlling theenergization of the trip coils, and means actuated by the interruptersfor successively connecting the trip coils in series with the contactmembers of the relay.

4. The combination with a main circuit, a plurality of feeder circuits,circuit interrupters for connecting the feeder circuits to the maincircuit and trip coilsfor the interrupters, of a relay responsive to theload on the main circuit for controlling the energization of the tripcoils, and means actuated by the interrupters for normally maintainingthe circuit of the trip coils 0 en and for connecting the samesuccessive y in series with the contact members of the relay.

5. The combination with a main circuit, a plurality of feeder circuits,circuit interrupters for connecting the feeder circuits to the maincircuit and tripping devices therefor, of a relay responsive to the loadon the main circuit for controlling the tripping devices, and meansactuated by the interrupters for connecting the tripping devices inseries with contact members of the relay in a redetermined order)" 6. ecombination with'a main circuit, a plurality of feeder circuits, circuitinterrupters for connecting the feeder circuits to the main circuit andtripping devices therefor, of a rela responslve to the load on the maincircui or controlling the tripping de vices, and means actuated by theinterrupters for successively connecting the trip ping'devioes in serieswith the contact members of the relay to cause the interrupters to betripped in a predetermined order.

In testimony whereof, I have hereunto SlbSCIllElBd my name this 28th dayof April, 1 17.

STEPHEN Q. HAYES.

